Constant Pressure vs Constant Volume Calorimeter

[Mariko Hashimoto 2I]

Can a constant volume calorimeter be used to calculate enthalpy? If so, is it any different than calculations with a constant pressure calorimeter?

[Rainy Liu Ruoshui_2K]

Enthalpy is defined to be the change of energy under constant pressure. Thus, a constant volume calorimeter can't be used to measure enthalpy.

[Samantha Melin 2E]

If a constant volume calorimeter cannot be used to calculate enthalpy values, what information can it give us?

[Anisa Subbiah 14B 1L]

A constant-volume calorimeter has a fixed volume (only pressure changes). It can be used to measure qv.

[Nancy_La_1H]

Constant volume calorimeter is used to calculate qv while a constant-pressure calorimeter is used to calculate qp(or the enthalpy of a reaction)

[Brandon Padilla 2L]

A constant pressure calorimeter can be used to calculate enthalpy, but not a constant volume calorimeter as it is used to calculate qv.

[Kimberly_martinez2I]

If a constant volume calorimeter cannot be used to calculate enthalpy values, what information can it give us?

Since this calorimeter has a fixed volume it measures the internal change of energy for a combustion reaction.

[Ivy Vo Dis 1C]

Enthalpy is the change in energy of a system under a constant pressure. A constant volume calorimeter cannot be used to calculate enthalpy. A constant volume calorimeter can only help us to find the value of Qv.

[405479701]

With a constant-volume calorimeter only pressure changes so it has a fixed volume.This can be now used to measure qv.